JPH10112968A - Voice coil motor - Google Patents
Voice coil motorInfo
- Publication number
- JPH10112968A JPH10112968A JP28153996A JP28153996A JPH10112968A JP H10112968 A JPH10112968 A JP H10112968A JP 28153996 A JP28153996 A JP 28153996A JP 28153996 A JP28153996 A JP 28153996A JP H10112968 A JPH10112968 A JP H10112968A
- Authority
- JP
- Japan
- Prior art keywords
- permanent magnet
- yoke
- gap
- main
- auxiliary
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Reciprocating, Oscillating Or Vibrating Motors (AREA)
Abstract
(57)【要約】
【課題】 主磁束を発生させる主永久磁石からサイドヨ
ークおよび外側ヨークに流れる漏洩磁束を少なくして効
率を高め、サイドフォースを低減させる。
【解決手段】 外側ヨーク１とセンターヨーク２を空隙
Ｇを介して対向させ、両端相互間を連結するサイドヨー
ク３を設けて磁路を形成させる。この空隙対向面の少な
くとも一方に主永久磁石４を固着させ、空隙Ｇ内にコイ
ル５を配置してボイスコイルモータを構成する。このボ
イスコイルモータのサイドヨーク３の内側面に補助永久
磁石８を一方の極面で取り付け、他方の極面を空隙Ｇに
対向させ、この空隙に対向する極面の極性を、主永久磁
石４の空隙側の極性と同極性になるようにしてある。主
永久磁石端部の磁界と補助永久磁石の磁界が同極性にな
って主磁束の漏洩を減少させ、主磁束の方向と直角方向
のベクトル成分を小さくしてサイドフォースを低減させ
る。
[PROBLEMS] To reduce leakage magnetic flux flowing from a main permanent magnet that generates a main magnetic flux to a side yoke and an outer yoke to increase efficiency and reduce side force. SOLUTION: An outer yoke 1 and a center yoke 2 are opposed to each other via a gap G, and a magnetic path is formed by providing a side yoke 3 connecting both ends. The main permanent magnet 4 is fixed to at least one of the gap facing surfaces, and the coil 5 is arranged in the gap G to constitute a voice coil motor. An auxiliary permanent magnet 8 is attached to the inner side surface of the side yoke 3 of this voice coil motor on one pole surface, the other pole surface is opposed to the gap G, and the polarity of the pole face facing this gap is changed to the main permanent magnet 4. Is made to have the same polarity as that of the gap side. The magnetic field at the end of the main permanent magnet and the magnetic field of the auxiliary permanent magnet have the same polarity to reduce the leakage of the main magnetic flux, reduce the vector component in the direction perpendicular to the direction of the main magnetic flux, and reduce the side force.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ボイスコイルモー
タにおけるサイドフォースを低減させる構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for reducing a side force in a voice coil motor.
【０００２】[0002]
【従来の技術】磁気ディスク装置やスデッパ露光装置の
除振用等に用いられるボイスコイルモータは、図９に示
すように、両側に設けた外側ヨーク１、１の内側に空隙
Ｇを介してセンターヨーク２を平行にそなえ、外側ヨー
ク１とセンターヨーク２の両端部相互をサイドヨーク３
で連結して閉磁路を構成し、外側ヨーク１の内側面に取
り付けた永久磁石４による主磁束φｍが、Ｎ極から空隙
Ｇを通ってセンターヨーク２に入り、サイドヨーク３お
よび外側ヨーク１を経てＳ極に戻る磁路を形成してお
り、前記空隙Ｇ内に配置したコイル５と鎖交してコイル
坦体６に推力を与えるようになっている。しかし、ボイ
スコイルモータでは空隙Ｇ内にコイル５とコイル坦体６
を設けて推力を取り出すため空隙Ｇが大きくなり、永久
磁石４の両側端部からサイドヨーク３あるいは外側ヨー
ク１に漏洩磁束φ1 、φ2 を生じ、図１０に示すよう
に、この漏洩磁束に含まれている空隙方向に対して直角
な磁束ベクトル成分Ｂｘが大きくなっている。空隙方向
のベクトル成分Ｂｙは、コイルが移動したときに推力の
発生に作用するが、ベクトル成分Ｂｘは推力の方向に対
して直角方向に働くサイドフォースと称する有害な力を
発生する。このため、実開昭６０−１５１２９３号で
は、永久磁石４の磁極面とヨークとの接続する面を除い
て永久磁石４のすべての表面を覆う補助磁石を設けたも
のが提案されている。2. Description of the Related Art As shown in FIG. 9, a voice coil motor used for vibration isolation of a magnetic disk device or a stripper exposure device has a center formed through a gap G inside outer yokes 1, 1 provided on both sides. A yoke 2 is provided in parallel, and both ends of the outer yoke 1 and the center yoke 2 are connected to a side yoke 3.
The main magnetic flux φm from the permanent magnet 4 attached to the inner surface of the outer yoke 1 enters the center yoke 2 from the N pole through the gap G, and connects the side yoke 3 and the outer yoke 1. A magnetic path returning to the S-pole is formed, and is linked to the coil 5 arranged in the gap G to apply a thrust to the coil carrier 6. However, in the voice coil motor, the coil 5 and the coil carrier 6
In order to take out the thrust by providing the air gap G, the gap G becomes large, and leakage magnetic fluxes φ 1 and φ 2 are generated in the side yoke 3 or the outer yoke 1 from both side ends of the permanent magnet 4, and as shown in FIG. The magnetic flux vector component Bx perpendicular to the included gap direction is large. The vector component By in the gap direction acts on the generation of a thrust when the coil moves, whereas the vector component Bx generates a harmful force called a side force acting in a direction perpendicular to the direction of the thrust. For this reason, Japanese Utility Model Laid-Open Publication No. S60-151293 proposes a configuration in which an auxiliary magnet is provided to cover all surfaces of the permanent magnet 4 except for a surface connecting the magnetic pole surface of the permanent magnet 4 and the yoke.
【０００３】[0003]
【発明が解決しようとする課題】このように、従来のボ
イスコイルモータは、永久磁石端部からの漏洩磁束によ
って生じるサイドフォースが大きく、効率が低下してい
る。また、実開昭６０−１５１２９３号のように、永久
磁石の側面全部を囲むように、磁石側面に接してサイド
ヨーク３と外側ヨーク１との間に補助磁石を充填して設
けたものでは、補助磁石の取り付けが面倒になるだけで
なく、有効ストロークが永久磁石の長さに制限され、大
きな補助磁石を必要とするため、その磁束によるヨーク
の飽和が大きい欠点がある。As described above, in the conventional voice coil motor, the side force generated by the leakage magnetic flux from the end of the permanent magnet is large, and the efficiency is reduced. Further, as in Japanese Utility Model Application Laid-Open No. 60-151293, an auxiliary magnet is provided between the side yoke 3 and the outer yoke 1 in contact with the magnet side surface so as to surround the entire side surface of the permanent magnet. Not only is the mounting of the auxiliary magnet complicated, but the effective stroke is limited to the length of the permanent magnet, and a large auxiliary magnet is required.
【０００４】[0004]
【課題を解決するための手段】本発明は、外側ヨークと
センターヨークを空隙を介して対向させ、前記外側ヨー
クとセンターヨークの空隙対向面のいずれか一方に主磁
束を発生させる主永久磁石を固着し、外側ヨークとセン
ターヨークの両端間を連結するサイドヨークを設けて磁
路を形成させ、前記空隙内にコイルを配置したボイスコ
イルモータにおいて、前記サイドヨークの内側面に補助
永久磁石を一方の極面で取り付け、この補助永久磁石の
空隙に対向する他方の極面の極性が、前記主永久磁石の
空隙側の極性と同極性になるようにしている。また、外
側ヨークとセンターヨークの両方の空隙対向面にそれぞ
れ主磁束を発生させる主永久磁石を固着したボイスコイ
ルモータでは、前記サイドヨークの内側面の空隙中心位
置から外側ヨーク側とセンターヨーク側にそれぞれ補助
永久磁石を取り付け、この補助永久磁石の空隙に対向す
る極面の極性が、それぞれの側の主永久磁石の空隙側の
極性と同極性になるようにしてある。According to the present invention, there is provided a main permanent magnet which causes an outer yoke and a center yoke to face each other via a gap, and generates a main magnetic flux on one of the gap-facing surfaces of the outer yoke and the center yoke. In a voice coil motor in which a magnetic path is formed by providing a side yoke which is fixed and connects between both ends of an outer yoke and a center yoke, and a coil is disposed in the gap, an auxiliary permanent magnet is provided on the inner surface of the side yoke. And the polarity of the other pole surface facing the gap of the auxiliary permanent magnet is the same as the polarity of the gap side of the main permanent magnet. Further, in a voice coil motor in which main permanent magnets for generating a main magnetic flux are fixed to both air gap opposing surfaces of the outer yoke and the center yoke, the outer yoke side and the center yoke side move from the center of the air gap on the inner side surface of the side yoke. Each of the auxiliary permanent magnets is attached so that the polarity of the pole surface facing the gap of the auxiliary permanent magnet is the same as the polarity of the gap side of the main permanent magnet on each side.
【０００５】[0005]
【発明の実施の形態】このように、外側ヨークの内側
に、空隙を介して設けたセンターヨークと、外側ヨーク
両端とセンターヨークを連結するサイドヨークを設け、
前記外側ヨークとセンターヨークのいずれか一方の空隙
対向面に、主磁束を発生させる主永久磁石をそなえると
ともに、サイドヨークの内側面に一方の極面を接触させ
他方の極面を空隙に対向させて取り付けられ、空隙に対
向する極面の極性を、主永久磁石の空隙側の極性と同極
性になるようにした補助永久磁石を設けており、主永久
磁石の端部に近い磁性体の極性が同極性になって、主永
久磁石からサイドヨークや外側ヨークへの漏洩磁束の発
生を押さえ、空隙方向のベクトル成分Ｂｙを大きくする
ようにしてある。なお、補助永久磁石を台形断面にし、
あるいはサイドヨークの内側面に傾斜した取付座を設け
ることにより、補助永久磁石の主永久磁石側を他方側よ
り高くして、補助永久磁石を主永久磁石端面に近づける
ことにより、主永久磁石を固着したヨークへの漏洩磁束
を少なくすることができる。また、外側ヨークとセンタ
ーヨークの空隙対向面の両方に主磁束を発生させる主永
久磁石を固着させる場合は、サイドヨークの内側面の空
隙中心位置から外側ヨーク側とセンターヨーク側にそれ
ぞれ別の補助永久磁石を設け、この補助永久磁石の空隙
に対向する極面の極性が、それぞれの側の主永久磁石の
空隙側の極性と同極性になるようにしており、補助永久
磁石相互の空隙に対向する極面の極性が反対になり、対
向する空隙中の主磁束の方向と、補助永久磁石による補
助磁束の方向が同一方向になるようにしている。As described above, a center yoke provided through a gap and side yokes connecting both ends of the outer yoke and the center yoke are provided inside the outer yoke.
One of the outer yoke and the center yoke is provided with a main permanent magnet for generating a main magnetic flux on one of the gap opposing surfaces, and one of the pole faces is brought into contact with the inner side surface of the side yoke so that the other pole face is opposed to the gap. Auxiliary permanent magnets are installed so that the polarity of the pole surface facing the gap is the same as the polarity of the gap side of the main permanent magnet, and the polarity of the magnetic body near the end of the main permanent magnet is provided. Have the same polarity to suppress the generation of magnetic flux leakage from the main permanent magnet to the side yoke and the outer yoke, thereby increasing the vector component By in the gap direction. The auxiliary permanent magnet has a trapezoidal cross section,
Alternatively, by providing an inclined mounting seat on the inner surface of the side yoke, the main permanent magnet side of the auxiliary permanent magnet is made higher than the other side, and the auxiliary permanent magnet is brought closer to the main permanent magnet end face, so that the main permanent magnet is fixed. Magnetic flux leaked to the yoke can be reduced. When a main permanent magnet that generates a main magnetic flux is fixed to both the outer yoke and the center yoke facing the gap, separate auxiliary magnets are provided on the outer yoke side and the center yoke side from the center of the gap on the inner side surface of the side yoke. A permanent magnet is provided so that the polarity of the pole face facing the gap of the auxiliary permanent magnet is the same as the polarity of the gap side of the main permanent magnet on each side, and faces the gap between the auxiliary permanent magnets. The direction of the main magnetic flux in the opposed air gap is the same as the direction of the auxiliary magnetic flux by the auxiliary permanent magnet.
【０００６】[0006]
【実施例】これを図に示す実施例について説明する。図
１および図２は、主永久磁石を空隙の一方（図では外側
ヨーク）に設けた場合の実施例を示すもので、１、１は
板状の外側ヨーク、２は前記外側ヨーク１、１の中間に
空隙Ｇを介して平行に配置されたセンターヨーク、３は
前記外側ヨーク１、１とセンターヨーク２の両端相互を
連結して閉磁路を構成するサイドヨーク、４は外側ヨー
ク１の内側面に取り付けた主永久磁石で、空隙Ｇ側にＮ
極を配置して主磁束φｍを発生させている。５は前記空
隙Ｇ内に配置したコイル、６はコイル坦体で、ヨークよ
り外側に設けた連結座７に図示しない可動体を連結して
推力を伝達する。８はサイドヨーク３の内側面に取り付
けた補助永久磁石で、主永久磁石４の空隙側の極性Ｎと
同じ極性のＮ極の極面を空隙Ｇと対向させ、Ｓ極の極面
をサイドヨーク３に接触させて取り付けている。φｓは
補助磁束である。したがって、図３に示すように、主永
久磁石４の空隙側端部からサイドヨーク３あるいは外側
ヨーク１へ漏洩しようとする磁束φ1、φ2の通路に同極
性の補助永久磁石８の磁界が形成されるため、漏洩磁束
φ2 が減少し、磁束φ1 はサイドヨーク３に流れずにセ
ンターヨーク２側に修正される。このため、主磁束φｍ
を有効に利用できるとともに、主永久磁石端部における
磁束φ1 に含まれる主磁束φｍ方向の磁束ベクトル成分
Ｂｙが大きく、これと直角方向の磁束ベクトル成分Ｂｘ
が小さくなり、コイル坦体６に作用する推力を増大さ
せ、サイドフォースを減少させることができる。なお、
主永久磁石４の空隙側がＳ極になるように取り付けられ
ている場合は、補助永久磁石８の極性を空隙に対向する
極面がＳ極になるようにすればよく、主永久磁石４がセ
ンターヨーク２に取り付けられている場合も、同様に補
助永久磁石８の空隙に対向する極面の極性を、主永久磁
石４の空隙側の極性と同じ極性にしておけばよく、補助
永久磁石８は主永久磁石４の端面に対向する位置からサ
イドヨーク３になるべく接近する位置までの極面をそな
えることが望ましい。DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiment shown in FIG. FIGS. 1 and 2 show an embodiment in which a main permanent magnet is provided in one of the air gaps (outer yoke in the figure), where 1 and 1 are plate-shaped outer yokes and 2 are outer yokes 1 and 1. The center yoke 3 is disposed in the middle of the outer yoke 1 in parallel with a gap G. Side yokes 1 and 2 connect both ends of the outer yokes 1 and 1 and the center yoke 2 to form a closed magnetic circuit. Main permanent magnet attached to the side, N on the gap G side
The poles are arranged to generate a main magnetic flux φm. Reference numeral 5 denotes a coil arranged in the gap G, and reference numeral 6 denotes a coil carrier, which transmits a thrust by connecting a movable body (not shown) to a connection seat 7 provided outside the yoke. Reference numeral 8 denotes an auxiliary permanent magnet attached to the inner side surface of the side yoke 3. The auxiliary permanent magnet has an N pole having the same polarity as the polarity N on the gap side of the main permanent magnet 4 facing the gap G, and an S pole having a pole face of the side yoke. 3 and attached. φs is an auxiliary magnetic flux. Therefore, as shown in FIG. 3, the magnetic field of the auxiliary permanent magnets 8 of the same polarity is applied to the paths of the magnetic fluxes φ 1 and φ 2 that are to leak from the gap side end of the main permanent magnet 4 to the side yoke 3 or the outer yoke 1. As a result, the leakage magnetic flux φ 2 is reduced, and the magnetic flux φ 1 is corrected to the center yoke 2 side without flowing to the side yoke 3. Therefore, the main magnetic flux φm
It is possible to effectively use the main magnetic flux φm direction of the magnetic flux vector component By greatly included in the magnetic flux phi 1 in the main permanent magnet ends, which perpendicular direction of the magnetic flux vector components Bx
Is reduced, the thrust acting on the coil carrier 6 is increased, and the side force can be reduced. In addition,
When the main permanent magnet 4 is mounted such that the gap side of the main permanent magnet 4 has the S pole, the polarity of the auxiliary permanent magnet 8 may be such that the pole surface facing the gap is the S pole. Similarly, in the case where the auxiliary permanent magnet 8 is attached to the yoke 2, the polarity of the pole face facing the gap of the auxiliary permanent magnet 8 may be the same as the polarity of the gap side of the main permanent magnet 4. It is desirable to have a pole face from a position facing the end face of the main permanent magnet 4 to a position as close to the side yoke 3 as possible.
【０００７】図４は、図１と同様の構成において、補助
永久磁石８を台形断面に形成して外側ヨーク１側の高さ
をセンターヨーク２側の高さより大きくしており、外側
ヨーク側の極面を主永久磁石４の端面に近づけて、主永
久磁石４の端部から外側ヨーク１に漏洩する磁束を制限
するようにしている。また、図５に示すように、サイド
ヨーク３の内側面に外側ヨーク１側が高くなった取付座
９を設け、この傾斜した取付座９に厚さが均一な補助永
久磁石８を固着させることにより、外側ヨーク１側の補
助永久磁石位置を高くして主永久磁石４の端面に接近さ
せるようにすることもできる。なお、主永久磁石４がセ
ンターヨーク２に固着されている場合は、補助永久磁石
８のセンターヨーク側を高くする。FIG. 4 shows a configuration similar to that of FIG. 1, in which the auxiliary permanent magnet 8 is formed in a trapezoidal cross section so that the height on the outer yoke 1 side is larger than the height on the center yoke 2 side. The pole face is brought close to the end face of the main permanent magnet 4 so as to limit the magnetic flux leaking from the end of the main permanent magnet 4 to the outer yoke 1. Further, as shown in FIG. 5, a mounting seat 9 having a raised outer yoke 1 is provided on the inner side surface of the side yoke 3, and an auxiliary permanent magnet 8 having a uniform thickness is fixed to the inclined mounting seat 9. Alternatively, the position of the auxiliary permanent magnet on the side of the outer yoke 1 may be raised so as to approach the end face of the main permanent magnet 4. When the main permanent magnet 4 is fixed to the center yoke 2, the auxiliary permanent magnet 8 is made higher on the center yoke side.
【０００８】図６は、外側ヨーク１の内側面の軸方向に
２個の主永久磁石４１、４２をそなえ、それぞれに対向
するコイル５１、５２を同一のコイル担体６に設けた場
合の実施例を示すもので、２はセンターヨーク、３はサ
イドヨーク、８１、８２は補助永久磁石である。一方の
主永久磁石４１は、空隙Ｇに対向する極面をＮ極にし、
他方の主永久磁石４２の空隙に対向する極面をＳ極にし
ており、隣り合う主磁束φｍの方向が逆方向になるた
め、コイル５１、５２は相互に反対方向に巻装してい
る。この構造では、主永久磁石４１側のサイドヨーク３
の内側面に取り付けた補助永久磁石８１は、空隙Ｇと対
向する極面を主永久磁石４１と同じＮ極とし、他方の主
永久磁石４２側のサイドヨーク内側面の補助永久磁石８
２は、空隙と対向する極面がＳ極になるように取り付け
てある。したがって、主永久磁石４１、４２からサイド
ヨーク３へ漏洩しようとする磁束は、サイドヨークに取
り付けた補助永久磁石の極面が同極性であるため、サイ
ドヨークへの漏洩が減少し、空隙Ｇ内の主磁束方向の磁
束ベクトルを大きくしてサイドフォースを減少させる。
なお、補助永久磁石８１、８２は、図４あるいは図５の
ように傾斜させることができる。FIG. 6 shows an embodiment in which two main permanent magnets 41 and 42 are provided in the axial direction on the inner surface of the outer yoke 1 and coils 51 and 52 facing each other are provided on the same coil carrier 6. 2 is a center yoke, 3 is a side yoke, and 81 and 82 are auxiliary permanent magnets. One main permanent magnet 41 has a pole face facing the gap G as an N pole,
The pole face of the other main permanent magnet 42 facing the air gap is an S pole, and the directions of the adjacent main magnetic flux φm are opposite, so that the coils 51 and 52 are wound in opposite directions. In this structure, the side yoke 3 on the main permanent magnet 41 side is used.
The auxiliary permanent magnet 81 attached to the inner surface of the auxiliary permanent magnet 81 has the same pole as the main permanent magnet 41 on the pole surface facing the gap G, and the auxiliary permanent magnet 8 on the inner surface of the side yoke on the other main permanent magnet 42 side.
No. 2 is attached so that the polar surface facing the air gap is an S pole. Therefore, the magnetic flux that is going to leak from the main permanent magnets 41 and 42 to the side yoke 3 is less likely to leak to the side yoke because the polar faces of the auxiliary permanent magnets attached to the side yoke have the same polarity. , The side force is reduced by increasing the magnetic flux vector in the main magnetic flux direction.
Note that the auxiliary permanent magnets 81 and 82 can be inclined as shown in FIG. 4 or FIG.
【０００９】図７は、外側ヨーク１とセンターヨーク２
の空隙Ｇ側の面に、それぞれ主永久磁石４ａ、４ｂを取
り付けた場合の実施例で、補助永久磁石８は、サイドヨ
ーク３の内側面に空隙Ｇの中心位置からそれぞれ主永久
磁石４ａおよび４ｂ側に片寄らせて設けた２個の補助永
久磁石８ａ、８ｂで構成されており、外側ヨーク１側の
補助永久磁石８ａの空隙と対向する極面の極性を、外側
ヨークに取り付けた主永久磁石４ａの空隙側の極性Ｎと
同極性のＮ極にし、センターヨーク２側に取り付けた補
助永久磁石８ｂの空隙と対向する極面の極性を、主永久
磁石４ｂの空隙側の極性Ｓと同極性のＳ極にしてある。
したがって、主磁束φｍと補助磁束φｓの方向が等し
く、主永久磁石４ａの端部から外側ヨーク１へ漏洩する
磁束は、補助永久磁石８ａが同極性の磁界のため遮ら
れ、センターヨーク２側の主永久磁石４ｂの端部からサ
イドヨーク３へ漏洩する磁束は、補助永久磁石８ｂの磁
界で遮られる。FIG. 7 shows an outer yoke 1 and a center yoke 2.
In the embodiment in which the main permanent magnets 4a and 4b are attached to the surface on the gap G side, the auxiliary permanent magnet 8 is provided on the inner surface of the side yoke 3 from the center position of the gap G, respectively. The main permanent magnet is constituted by two auxiliary permanent magnets 8a and 8b which are provided to be offset to the side, and the polarity of the polar surface facing the gap of the auxiliary permanent magnet 8a on the outer yoke 1 side is attached to the outer yoke. The polarity of the pole face opposite to the gap of the auxiliary permanent magnet 8b attached to the center yoke 2 is set to the same polarity as the polarity S of the gap side of the main permanent magnet 4b. S pole.
Accordingly, the directions of the main magnetic flux φm and the auxiliary magnetic flux φs are equal, and the magnetic flux leaking from the end of the main permanent magnet 4a to the outer yoke 1 is blocked by the auxiliary permanent magnet 8a because of the magnetic field of the same polarity. The magnetic flux leaking from the end of the main permanent magnet 4b to the side yoke 3 is blocked by the magnetic field of the auxiliary permanent magnet 8b.
【００１０】図８は外側ヨーク１とセンターヨーク２に
それぞれ軸方向に２組の主永久磁石４１ａ、４１ｂと４
２ａ、４２ｂを設けた場合の実施例で、一方の組の主永
久磁石４１ａ、４１ｂの空隙側の極性は４１ａがＮ極、
４１ｂがＳ極になっており、他方の組の主永久磁石４２
ａ、４２ｂの空隙側の極性は、４２ａがＳ極、４２ｂが
Ｎ極になっている。なお、各組の主永久磁石４１ａ、４
１ｂおよび４２ａ、４２ｂ側のコイル５１、５２は相互
に反対方向に巻装されている。この場合のサイドヨーク
３の内側面に取り付けられる補助永久磁石８１ａ、８１
ｂ、８２ａ、８２ｂは、空隙と対向する極面が、それぞ
れ対向する主永久磁石の空隙側の極性と同じ極性になる
ように取り付けられ、図の実施例では主永久磁石４１
ａ、４１ｂ側のサイドヨーク内側面には、外側ヨーク側
にＮ極を空隙に対向させた補助永久磁石８１ａを、セン
ターヨーク側にＳ極を空隙に対向させた補助永久磁石８
１ｂを設け、主永久磁石４２ａ、４２ｂ側のサイドヨー
ク内側面では極性を逆にして、外側ヨーク側にＳ極を空
隙に対向させた補助永久磁石８２ｂを、センターヨーク
側にＮ極を空隙に対向させた補助永久磁石８２ａを取り
付けており、いずれも図７の場合と同様に作用して漏洩
磁束を低減させ、サイドフォースを減少させる。FIG. 8 shows two sets of main permanent magnets 41a, 41b and 4 in the outer yoke 1 and the center yoke 2 in the axial direction, respectively.
In the embodiment in which 2a and 42b are provided, the polarity of the gap side of the main permanent magnets 41a and 41b of one set is N pole of 41a,
41b is the south pole, and the other pair of main permanent magnets 42
Regarding the polarity of the gap side of a and 42b, 42a is the S pole and 42b is the N pole. In addition, the main permanent magnets 41a, 4
The coils 51, 52 on the 1b and 42a, 42b sides are wound in mutually opposite directions. In this case, the auxiliary permanent magnets 81a and 81 attached to the inner side surface of the side yoke 3
b, 82a, and 82b are mounted such that the polar surfaces facing the gap have the same polarity as the polarity of the facing main permanent magnet on the gap side, respectively.
On the inner side surfaces of the side yokes a and 41b, an auxiliary permanent magnet 81a having an N pole facing the air gap on the outer yoke side and an auxiliary permanent magnet 8 having an S pole facing the air gap on the center yoke side.
1b, the polarity is reversed on the inner side surface of the side yoke on the side of the main permanent magnets 42a and 42b, and the auxiliary permanent magnet 82b with the S pole facing the gap on the outer yoke side and the N pole on the center yoke side with the gap. Attached auxiliary permanent magnets 82a are attached, and all operate in the same manner as in FIG. 7 to reduce leakage magnetic flux and reduce side force.
【００１１】[0011]
【発明の効果】このように本発明は、外側ヨークとセン
ターヨークを空隙を介して対向させ、外側ヨークとセン
ターヨークの両端相互間を連結するサイドヨークを設け
て磁路を形成させ、前記外側ヨークとセンターヨークの
いずれか一方の空隙対向面に主磁束を発生させる主永久
磁石を固着し、空隙内にコイルを配置したボイスコイル
モータにおいて、前記サイドヨークの内側面に、空隙に
対向する極面の極性が前記主永久磁石の空隙側の極性と
同極性になるようにした補助永久磁石を設けてあるの
で、主永久磁石からサイドヨークや外側ヨークに漏洩す
る磁束を減少させ、主永久磁石端部の主磁束に含まれる
磁束ベクトル成分Ｂｙを大きくし、これと直角方向の磁
束ベクトル成分Ｂｘを小さくしてコイル坦体に作用する
推力を増大させ、サイドフォースを小さくする効果があ
る。また、補助永久磁石をサイドヨークの内側面に取り
付けるため、コイル坦体の移動を制限することがなく、
大きなコイル移動を行わせることができ、構造も簡単で
組み立てが容易であるなどの利点がある。なお、補助永
久磁石を台形断面に形成し、あるいはサイドヨーク内側
面に傾斜した取付座を設けて補助永久磁石を固着させる
ことにより、補助永久磁石の主永久磁石と対向する側を
高くして主永久磁石の端面に近づけ、外側ヨークへの漏
洩をさらに有効に減少させることができる。As described above, according to the present invention, the outer yoke and the center yoke are opposed to each other with a gap therebetween, and a side yoke connecting the both ends of the outer yoke and the center yoke is provided to form a magnetic path. In a voice coil motor in which a main permanent magnet for generating a main magnetic flux is fixed to a gap opposing surface of one of a yoke and a center yoke and a coil is disposed in the gap, a pole facing the gap is provided on an inner surface of the side yoke. Since the auxiliary permanent magnet whose surface polarity is the same as the polarity of the gap side of the main permanent magnet is provided, the magnetic flux leaking from the main permanent magnet to the side yoke and the outer yoke is reduced, The magnetic flux vector component By included in the main magnetic flux at the end is increased, and the magnetic flux vector component Bx in the direction perpendicular to this is reduced to increase the thrust acting on the coil carrier. There is an effect of reducing the Dofosu. Also, since the auxiliary permanent magnet is attached to the inner surface of the side yoke, there is no restriction on the movement of the coil carrier,
There are advantages such as a large coil movement, a simple structure, and easy assembly. The auxiliary permanent magnet is formed in a trapezoidal cross section, or an inclined mounting seat is provided on the inner surface of the side yoke to fix the auxiliary permanent magnet, so that the side facing the main permanent magnet of the auxiliary permanent magnet is raised. The leakage to the outer yoke can be further effectively reduced by approaching the end face of the permanent magnet.
【００１２】また、外側ヨークとセンターヨークの空隙
対向面にそれぞれ主磁束を発生させる主永久磁石を固着
したボイスコイルモータにおいては、サイドヨークの内
側面の空隙中心位置から外側ヨーク側とセンターヨーク
側にそれぞれ補助永久磁石を設け、前記補助永久磁石の
空隙に対向する側の極性が、それぞれの側の主永久磁石
の空隙側の極性と同極性になるようにすることによって
前記と同様の効果を得ることができる。Further, in a voice coil motor in which main permanent magnets for generating a main magnetic flux are fixed to the gap-facing surfaces of the outer yoke and the center yoke, respectively, the outer yoke side and the center yoke side from the center of the gap on the inner side surface of the side yoke. The same effect as described above is provided by providing auxiliary permanent magnets in each of the above, so that the polarity of the side of the auxiliary permanent magnet facing the gap is the same as the polarity of the gap side of the main permanent magnet on each side. Obtainable.
【００１３】[0013]
【図１】本発明の実施例を示す構造説明図である。FIG. 1 is a structural explanatory view showing an embodiment of the present invention.
【図２】図１の斜視図である。FIG. 2 is a perspective view of FIG.
【図３】図１における磁束の状態を示す説明図である。FIG. 3 is an explanatory diagram showing a state of a magnetic flux in FIG. 1;
【図４】他の実施例を示す一部構造説明図である。FIG. 4 is a partial structural explanatory view showing another embodiment.
【図５】さらに別の実施例を示す一部構造説明図であ
る。FIG. 5 is a partial structural explanatory view showing still another embodiment.
【図６】主永久磁石を軸方向に複数設けた場合の実施例
を示す構造説明図である。FIG. 6 is a structural explanatory view showing an embodiment when a plurality of main permanent magnets are provided in the axial direction.
【図７】主永久磁石を空隙の両側に設けた実施例を示す
構造説明図である。FIG. 7 is a structural explanatory view showing an embodiment in which main permanent magnets are provided on both sides of a gap.
【図８】主永久磁石を空隙内に２組設けた場合の実施例
を示す構造説明図である。FIG. 8 is a structural explanatory view showing an embodiment in which two sets of main permanent magnets are provided in a gap.
【図９】従来の一般的な例を示す構造説明図である。FIG. 9 is a structural explanatory view showing a conventional general example.
【図１０】従来例における漏洩磁束の状態を示す説明図
である。FIG. 10 is an explanatory view showing a state of leakage magnetic flux in a conventional example.
１ 外側ヨーク ２ センターヨーク ３ サイドヨーク ４、４１、４２ 主永久磁石 ４ａ、４ｂ、４１ａ、４１ｂ、４２ａ、４２ｂ 主永久
磁石 ５、５１、５２ コイル ６ コイル坦体 ８、８１、８２ 補助永久磁石 ８ａ、８ｂ、８１ａ、８１ｂ、８２ａ、８２ｂ 補助永
久磁石 ９ 取付座 φｍ 主磁束 φｓ 補助磁束Reference Signs List 1 outer yoke 2 center yoke 3 side yoke 4, 41, 42 main permanent magnet 4a, 4b, 41a, 41b, 42a, 42b main permanent magnet 5, 51, 52 coil 6 coil carrier 8, 81, 82 auxiliary permanent magnet 8a , 8b, 81a, 81b, 82a, 82b Auxiliary permanent magnet 9 Mounting base φm Main magnetic flux φs Auxiliary magnetic flux
Claims (5)
して対向させ、外側ヨークとセンターヨークの両端相互
間を連結するサイドヨークを設けて磁路を形成させ、前
記外側ヨークとセンターヨークのいずれか一方の空隙対
向面に主磁束を発生させる主永久磁石を固着し、空隙内
にコイルを配置したボイスコイルモータにおいて、前記
サイドヨークの内側面に補助永久磁石を一方の極面で取
り付け、この補助永久磁石の空隙に対向する他方の極面
の極性が、前記主永久磁石の空隙側の極性と同極性にな
るようにしたことを特徴とするボイスコイルモータ。An outer yoke and a center yoke are opposed to each other with an air gap therebetween, and a side yoke connecting both ends of the outer yoke and the center yoke is provided to form a magnetic path. In a voice coil motor in which a main permanent magnet for generating a main magnetic flux is fixed to one of the air gap opposing surfaces and a coil is arranged in the air gap, an auxiliary permanent magnet is attached to the inner side surface of the side yoke on one pole surface, A voice coil motor, wherein the polarity of the other pole surface facing the gap of the permanent magnet is the same as the polarity of the gap side of the main permanent magnet.
着された主永久磁石の端面に対向する位置から他方のヨ
ークに近い位置までの極性面をそなえた平板な永久磁石
である請求項１のボイスコイルモータ。2. The permanent magnet according to claim 1, wherein the auxiliary permanent magnet is a flat permanent magnet having a polar surface from a position facing an end face of the main permanent magnet fixed to one yoke to a position near the other yoke. Voice coil motor.
するヨーク側の高さを他方側の高さより大きくした台形
断面に形成され、空隙に対向する面が傾斜している請求
項１のボイスコイルモータ。3. The auxiliary permanent magnet according to claim 1, wherein the auxiliary permanent magnet is formed in a trapezoidal cross section in which the height on the yoke side facing the main permanent magnet is larger than the height on the other side, and the surface facing the gap is inclined. Voice coil motor.
石を固着するヨーク側を高くした取付座をそなえ、この
取付座に平板な補助永久磁石を取り付けた請求項１のボ
イスコイルモータ。4. The voice coil motor according to claim 1, wherein an inner side surface of the side yoke is provided with a mounting seat having a raised yoke side for fixing a main permanent magnet, and a flat auxiliary permanent magnet is mounted on the mounting seat.
して対向させ、外側ヨークとセンターヨークの両端相互
間を連結するサイドヨークを設けて磁路を形成させ、前
記外側ヨークとセンターヨークの空隙対向面にそれぞれ
主磁束を発生させる主永久磁石を固着し、空隙内にコイ
ルを配置したボイスコイルモータにおいて、前記サイド
ヨークの内側面に、空隙の中心位置から外側ヨーク側と
センターヨーク側にそれぞれ補助永久磁石を一方の極面
で取り付け、前記補助永久磁石の空隙に対向する極面の
極性が、それぞれの側の主永久磁石の空隙側の極性と同
極性になるようにしたことを特徴とするボイスコイルモ
ータ。5. An outer yoke and a center yoke are opposed to each other via a gap, and a side yoke connecting both ends of the outer yoke and the center yoke is provided to form a magnetic path. In a voice coil motor in which a main permanent magnet for generating a main magnetic flux is fixed to each surface, and a coil is arranged in a gap, an auxiliary surface is provided on an inner side surface of the side yoke from the center position of the gap to an outer yoke side and a center yoke side. The permanent magnet is mounted on one pole face, and the polarity of the pole face facing the gap of the auxiliary permanent magnet is the same as the polarity of the gap side of the main permanent magnet on each side. Voice coil motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28153996A JP3769840B2 (en) | 1996-10-01 | 1996-10-01 | Voice coil motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28153996A JP3769840B2 (en) | 1996-10-01 | 1996-10-01 | Voice coil motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10112968A true JPH10112968A (en) | 1998-04-28 |
| JP3769840B2 JP3769840B2 (en) | 2006-04-26 |
Family
ID=17640592
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28153996A Expired - Fee Related JP3769840B2 (en) | 1996-10-01 | 1996-10-01 | Voice coil motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3769840B2 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001089067A1 (en) * | 2000-05-18 | 2001-11-22 | Nidec Copal Corporation | Electromagnetic actuator and shutter device for camera |
| JP2002525007A (en) * | 1998-08-29 | 2002-08-06 | コンティテク・バイブレーション・コントロール・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング | Electromagnetic actuator with oscillating spring mass system |
| KR100483955B1 (en) * | 2002-07-05 | 2005-04-18 | 한국과학기술원 | Voice Coil Motor for Data Storage Devices |
| JP2006081342A (en) * | 2004-09-10 | 2006-03-23 | Yaskawa Electric Corp | Voice coil actuator |
| US7329971B2 (en) * | 2002-06-06 | 2008-02-12 | Kabushiki Kaisha Yasakawa Denki | Voice coil-type linear motor with cooling function |
| EP1887679A1 (en) * | 2006-08-08 | 2008-02-13 | Selex Sensors and Airborne Systems Limited | Actuator |
| JP2008278709A (en) * | 2007-05-07 | 2008-11-13 | Jtekt Corp | Linear actuator |
| US7705702B2 (en) | 2006-08-08 | 2010-04-27 | Selex Galileo Ltd | Actuator |
| WO2018079672A1 (en) * | 2016-10-31 | 2018-05-03 | ヤマハ株式会社 | Actuator |
-
1996
- 1996-10-01 JP JP28153996A patent/JP3769840B2/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002525007A (en) * | 1998-08-29 | 2002-08-06 | コンティテク・バイブレーション・コントロール・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング | Electromagnetic actuator with oscillating spring mass system |
| WO2001089067A1 (en) * | 2000-05-18 | 2001-11-22 | Nidec Copal Corporation | Electromagnetic actuator and shutter device for camera |
| US6705776B2 (en) | 2000-05-18 | 2004-03-16 | Nidec Copal Corporation | Electromagnetic actuator and shutter device for camera |
| US7329971B2 (en) * | 2002-06-06 | 2008-02-12 | Kabushiki Kaisha Yasakawa Denki | Voice coil-type linear motor with cooling function |
| KR100483955B1 (en) * | 2002-07-05 | 2005-04-18 | 한국과학기술원 | Voice Coil Motor for Data Storage Devices |
| JP2006081342A (en) * | 2004-09-10 | 2006-03-23 | Yaskawa Electric Corp | Voice coil actuator |
| EP1887679A1 (en) * | 2006-08-08 | 2008-02-13 | Selex Sensors and Airborne Systems Limited | Actuator |
| US7705702B2 (en) | 2006-08-08 | 2010-04-27 | Selex Galileo Ltd | Actuator |
| JP2008278709A (en) * | 2007-05-07 | 2008-11-13 | Jtekt Corp | Linear actuator |
| WO2018079672A1 (en) * | 2016-10-31 | 2018-05-03 | ヤマハ株式会社 | Actuator |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3769840B2 (en) | 2006-04-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3230647B2 (en) | DC reactor | |
| JP2007110822A (en) | Periodic magnetic field generator, manufacturing method thereof, and linear motor using the periodic magnetic field generator | |
| WO2020215786A1 (en) | Vibration sounding device and electronic product | |
| JP3769840B2 (en) | Voice coil motor | |
| CN111828525A (en) | Novel electromagnetic vibration isolator with adjustable negative stiffness | |
| JP7762854B2 (en) | Lens drive unit and lens barrel equipped with same | |
| JP2001112228A (en) | Magnet movable linear actuator | |
| JP4594093B2 (en) | Drive device | |
| US8378542B2 (en) | Magnetic centre-finding device with no magnet on the rotor and with small air gap | |
| JP3882977B2 (en) | Voice coil linear motor | |
| JP3666692B2 (en) | Magnetic circuit for speakers | |
| JP4711160B2 (en) | Linear motor armature and linear motor | |
| JPH1169754A (en) | Movable permanent magnet dc linear motor | |
| JPH02246762A (en) | linear motor | |
| JP2004023969A (en) | Voice coil motor and magnetic disk unit using it | |
| JPH07303363A (en) | Linear actuator | |
| JP4232329B2 (en) | Stepping motor | |
| JP2601240Y2 (en) | Vibration actuator | |
| JP6586027B2 (en) | Linear motor and shut-off device | |
| JPH03112354A (en) | Linear actuator | |
| JPH08163850A (en) | Single pole dc linear motor | |
| JPH1127920A (en) | Electromagnetic actuator | |
| JP3731011B2 (en) | Single pole linear DC motor | |
| JPH05103457A (en) | Linear motor | |
| JP2000262031A (en) | Damper/generator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A977 | Report on retrieval |
Effective date: 20050829 Free format text: JAPANESE INTERMEDIATE CODE: A971007 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20051122 |
|
| A521 | Written amendment |
Effective date: 20051207 Free format text: JAPANESE INTERMEDIATE CODE: A523 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20060117 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20060130 |
|
| R150 | Certificate of patent (=grant) or registration of utility model |
Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Year of fee payment: 4 Free format text: PAYMENT UNTIL: 20100217 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110217 Year of fee payment: 5 |
|
| LAPS | Cancellation because of no payment of annual fees |